Virtual Machine with Question: There is no more space for the redo log

One of our virtual machines appeard to be in the vCenter server with a question sign, as you can see in the photo below:

When I stood on the virtual machine in the vCenter server I saw the following error:

In the summery tab I’ve noticed that the virtual machine’s LUN has only 9GB of free space, as appears in the photo below:

Solution

I went to the inventory of LUN 74 , and moved another machine into another LUN which has enough free space. Afterwards I returned to the virtual machine’s question and pressed retry and the probelm has been solved.